The Influence of the Mesh Element Size on the Natural Frequencies of Beam

Crastiu, Ion; Pop-Gozman, Calin; Deac, Sorin; Berce, Costel; Simoiu, Dorin; Bereteu, Liviu

doi:10.1109/sisy.2018.8524686

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…The denser the measurement grid, the greater the accuracy of the description of the successive modes of vibration. If the measurement grid is too sparse there is a risk that the vibration modes will not be detected or will be misidentified [22] The second factor in limiting the grid's density are the areal or local stiffening of the struc ture, such as structural reinforcement profiles (Figure 2), elements allowing the installa tion of additional panels to increase the protection of the crew, and structural openings The roof hull plate has two such openings. The first, located at the front, is intended fo the installation of the turret system.…”

Section: Experimental Studymentioning

confidence: 99%

Research of Vibrations of an Armoured Personnel Carrier Hull with FE Implementation

et al. 2021

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Modern wheeled armoured vehicles can perform a variety of tasks, making the development of weapon systems that can be safely and effectively integrated with the vehicle structure an area of interest. Due to the cost of implementing new models, it is more economical to test potential configurations using numerical methods, such as the finite element method. The numerical model has been validated to confirm the reliability of the obtained results. Modal tests were also performed using four configurations to identify the frequency and mode shape of natural vibrations occurring within the support structure. In an experimental setting, hull vibrations were forced using the modal hammer testing method. The modal assurance criterion (MAC) and the authors’ procedure were used to confirm the experimental and numerical test results. Additional testing in the form of impact loads was carried out for turret-containing structures. Structural strain at indicated points and forces transmitted by brackets to the bottom of the hull were compared.

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Section: Experimental Studymentioning

confidence: 99%

Research of Vibrations of an Armoured Personnel Carrier Hull with FE Implementation

et al. 2021

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“…The model was divided into a total of 327,300 units and 346,086 nodes. According to the research of some scholars [34][35][36], the size of the mesh affects the value of the result, but does not affect the change rule of the value. The purpose of this simulation mainly analyzes the stress change rule close to the cleat tip.…”

Section: Establishment Of Modelmentioning

confidence: 99%

Analysis of Application Parameters of Hydraulic Slotting Technology in Jointed Coal Reservoirs

Zuo

Wang

et al. 2019

Applied Sciences

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Hydraulic slotting technology is typically used in coal mines to enhance permeability and prevent gas outbursts. Because a coal seam contains many cleats and joints, this study investigated the influence of conventional application parameters on the hydraulic slotting effect by numerical simulation and experimental testing. The cleats in the coal generated stress concentration and initiated with the water jet impact, which promoted the formation of a complex fracture network. The optimized arrangement included angles with an inclination of 20–45° between the borehole and the coal seam strike. The water jet pressure and rotation speed determined the shape of the slot. A high water jet pressure and low rotation speed promoted the formation of cracks at the end of the slot and strengthened the permeability-enhancing effect. Coal fragments could more easily peel off from the sides of the seam and block the borehole. The high water pressure and low rotation speed application parameters were optimized without blocking the borehole. Results obtained by field application revealed that the gas extraction flow after optimization was 1.3 times that of conventional hydraulic slotting. An appropriate angle between the cleats and borehole can more effectively increase the permeability of the coal seam and results in higher gas drainage flow. The results of this study can be useful as guidelines for field applications of hydraulic slotting technology.

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The Influence of the Mesh Element Size on the Natural Frequencies of Beam

Cited by 2 publications

References 8 publications

Research of Vibrations of an Armoured Personnel Carrier Hull with FE Implementation

Research of Vibrations of an Armoured Personnel Carrier Hull with FE Implementation

Analysis of Application Parameters of Hydraulic Slotting Technology in Jointed Coal Reservoirs

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